<template>
    <div id="app">
        <h3>案例：折叠面板</h3>
        <div>
            <div class="title">
                <h4>芙蓉楼送辛渐</h4>
                <span class="btn" @click="isShow=!isShow">
                    {{isShow ? '收起': '展开'}}
                </span>
            </div>
            <div class="container" v-show="isShow">
                <p>寒雨连江夜入吴,</p>
                <p>平明送客楚山孤。</p>
                <p>洛阳亲友如相问，</p>
                <p>一片冰心在玉壶。</p>
            </div>
        </div>
    </div>
</template>

<script>
    export default {
        data() {
            return {
                isShow: true
            }
        }
    }
</script>

<style lang="less">
    body {
        background-color: #ccc;

        #app {
            width: 400px;
            margin: 20px auto;
            background-color: #fff;
            border: 4px solid blueviolet;
            border-radius: 1em;
            box-shadow: 3px 3px 3px rgba(0, 0, 0, 0.5);
            padding: 1em 2em 2em;

            h3 {
                text-align: center;
            }

            .title {
                display: flex;
                justify-content: space-between;
                align-items: center;
                border: 1px solid #ccc;
                padding: 0 1em;
            }

            .title h4 {
                line-height: 2;
                margin: 0;
            }

            .container {
                border: 1px solid #ccc;
                padding: 0 1em;
            }

            .btn {
                /* 鼠标改成手的形状 */
                cursor: pointer;
            }
        }
    }
</style>